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Amturnide

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Amturnide

Amturnide

OVERDOSE

Aliskiren

Limited data are available related to overdosage in humans. The most likely manifestation of overdosage would be hypotension. If symptomatic hypotension occurs, provide supportive treatment.

Amlodipine

Single oral doses of amlodipine maleate equivalent to 40 mg amlodipine/kg and 100 mg amlodipine/kg in mice and rats, respectively, caused deaths. Single oral amlodipine maleate doses equivalent to 4 or more mg amlodipine/kg or higher in dogs (11 or more times the maximum recommended human dose on a mg/m² basis) caused a marked peripheral vasodilation and hypotension.

Overdosage might be expected to cause excessive peripheral vasodilation with marked hypotension and possibly a reflex tachycardia. In humans, experience with intentional overdosage of amlodipine is limited. Reports of intentional overdosage include a patient who ingested 250 mg and was asymptomatic and was not hospitalized; another (120 mg) was hospitalized, underwent gastric lavage and remained normotensive; the third patient (105 mg) was hospitalized and had hypotension (90/50 mmHg), which normalized following plasma expansion. A case of accidental drug overdose has been documented in a 19-month-old male who ingested 30 mg amlodipine (about 2 mg/kg). During the emergency room presentation, vital signs were stable with no evidence of hypotension but a heart rate of 180 bpm. Ipecac was administered 3.5 hours after ingestion, and on subsequent observation (overnight) no sequelae were noted.

If massive overdose occurs, institute active cardiac and respiratory monitoring. Frequent blood pressure measurements are essential. If hypotension occurs, initiate cardiovascular support including elevation of the extremities and the judicious administration of fluids. If hypotension remains unresponsive to these conservative measures, consider administration of vasopressors (such as phenylephrine), with attention to circulating volume and urine output. Intravenous calcium gluconate may help to reverse the effects of calcium entry blockade. As amlodipine is highly protein bound, hemodialysis is not likely to be of benefit.

HCTZ

The most common signs and symptoms of overdose observed in humans are those caused by electrolyte depletion (hypokalemia, hypochloremia, hyponatremia) and dehydration resulting from excessive diuresis. If digitalis has also been administered, hypokalemia may accentuate cardiac arrhythmias. The degree to which HCTZ is removed by hemodialysis has not been established. The oral LD50 of HCTZ is greater than 10 g/kg in both mice and rats. These doses are 1946 and 3892 times, respectively, the MRHD of 25 mg/day, when based on a mg/m² basis of a 60-kg individual.

CONTRAINDICATIONS

Amturnide is contraindicated in patients with anuria or hypersensitivity to sulfonamide-derived drugs like HCTZ [see WARNINGS AND PRECAUTIONS and ADVERSE REACTIONS]. Hypersensitivity reactions may range from urticaria to anaphylaxis.

Last reviewed on RxList: 2/15/2012
This monograph has been modified to include the generic and brand name in many instances.

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